#include<iostream>
#include<cstring>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<netinet/in.h>

void Usage(const std::string &proc)
{
    std::cout << "\n\tUsage: " << proc << "serverip serverport\n" << std::endl; 
}

int main(int argc, char *argv[])
{
    if(argc != 3)
    {
        Usage(argv[0]);
        exit(1); 
    }

    std::string serverip = argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport);
    inet_pton(AF_INET, serverip.c_str(), &(server.sin_addr));

    while(true)
    {
        int cnt = 5;
        int isreconnect = false;
        int sockfd = 0;
        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        if(sockfd < 0)
        {
            std::cerr << "socket error" << std::endl; 
            return 1; 
        }

        do
        {
            int n = connect(sockfd, (struct sockaddr*)&server, sizeof(server));
            if(n < 0)
            {
                isreconnect = true;
                cnt--;
                std::cerr << "connect error..., reconnect: " << cnt << std::endl; 
                sleep(2); 
            }
            else 
            {
                break; 
            }
        }while(cnt && isreconnect);

        if(cnt == 0)
        {
            std::cerr << "user offline..." << std::endl; 
            break; 
        }

        std::string message;
        std::cout << "Please Enter@ "; 
        std::getline(std::cin, message);

        int n = write(sockfd, message.c_str(), message.size());
        if(n < 0)
        {
            std::cerr << "write error..." << std::endl; 
        }

        char inbuffer[4096];
        n = read(sockfd, inbuffer, sizeof(inbuffer));
        if(n > 0)
        {
            inbuffer[n] = 0;
            std::cout << inbuffer << std::endl;

        }
        close(sockfd); 
    }
    return 0; 
}
